If you've ever seen a mercury barometer, the principle is exactly the same. The air pressue inside the container is essentially zero (absolute). the atmospheric air pressure is 14.7 psi absolute. So you have a pressure differential that is trying to push the water into the tank. When your chicken drinks out of the tank a little air slips into the tank, raising the air pressure in the tank; water runs out until the weight of the water once again equals the pressure of the air pushing it up into the tank.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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